Description

Return Values

Upon successful completion, these functions return x * FLT_RADIXn>.

If the result would cause overflow, a range error occurs and these
functions return ±HUGE_VAL, ±HUGE_VALF, and ±HUGE_VALL (according to the sign of x)
as appropriate for the return type of the function.

If x is NaN, a NaN is returned.

If x is ±0 or ±Inf, x is returned.

If x is 0, x is returned.

Errors

These functions will fail if:

Range Error

The result overflows.

If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the overflow floating-point exception is raised.

Usage

An application wanting to check for exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling
these functions. On return, if fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is
non-zero, an exception has been raised. An application should either examine the
return value or check the floating point exception flags to detect exceptions.